Water tube boiler



Aug. 28, 1,934. W 5 ALMY Er AL 1,972,003

WATER TUBE BOI LER Filed March 14, 1933 4 Sheets-Sheet l i )a IN1/EN T0125 ATTORNEYS.'

Aug. 28, 1934. w. s. ALMY Er Al. 159725003 WATER TUBE BOILER Filed March 14, 1933 4 Sheets-Sheet 2 nnnnnnnnnnnnnln.21!nnnnnnnnnnnnnnnnnnnnnn g uw lnnnntknn.nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn lll'lllllli Aug. 28, 1934.

W. S. ALMY l' AL.

WATER TUBE BOILER Filed March 14, 1933 4 Sheets-Sheet 5 oooooooooo oooooo VIII/1111111114. vlllllllll/ll111111111111111"lll/lllllllq AAug.V 28, 1934. w, s. ALMY Er AL 1,972,003

WATER TUBE BOILER Filed March 14, 1955 4 Sheets-Sheet 4 y y; '11111111111 A n lh'lflllfllllllllllll A TTORNEYS.

Patented Aug. 28, 1934 UNi WATER TUBE BOILER Walter S. Almy, Providence, and Charles F. H.

Almy, Edgewood, R.

I., assignors to Alrny Water Tube Boiler Company, Providence, R. I., a corporation of Rhode Island Applicationv March 14, 1933, Serial No. 680,636

7 Claims.

This invention relates to a boiler and has for one of its objects the compact arrangement of the heat transfer surfaces of the water tubes of a boiler.

Another object of the invention is the arrange--V ment of the water tubes whereby an economical oper-ation may be Yhad and an increased circulation and steaming provided in the boiler.

Another object of the invention is the provision of the arrangement of the tubes such that they may be easily accessible for cleaning purposes.

Another object of the invention is the provision of an arrangement which Will be quiet in starting by reason of the increased circulation.

Another object of the invention is the provision of a balanced arrangement with substantially equal portion of heating surface oneither side of the boiler that uniform circulation about the boiler may be provided.

A further object of the invention is the provision of tubes of such 'diameter and' of such shape that a maximum amount of heat may be absorbed and a maximum lifting action had on the Water contained Within the tubes.

A still further object of the 'invention is the provision of a box-shaped base drum to afford better circulation and heating in the boiler.

With these and other objects in view, the invention consists or" certain novel features of construction, as will be more fully described,

and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. l is a sectional View through substantially the center of the boiler looking from the front toward the rear thereof on line 1-1 of Fig. 2.

Fig; 2 is a central section on substantially line 2-2 of Fig. 1.

Fig. 3 is a section on line 3 3 of Fig. 1.

Fig. 4 isa section on line 4-4 of Fig. 1.

Fig. 5 is a perspective view illustrating the arrangement of the tubes of the boiler.

Fig. 6 is a view similar to Fig. 1 illustrating a down'draft instead of an updraft boiler as shown in Fig. 1.

Fig. '7 is a perspective view of a modiied form of base drinn. to which the lower ends of the tubes are connected.

It is desirable in the use of water tube boilers 50 to provide a maximum amount of heating surface in a compact area whichshall be consistent with a certain desired circulation of the Water through the tubes from the base drum to Vthe steam header, and in order that thismay be accomplished in a fountain type Water tubeboiler We have so arranged the water tubes that they may be positioned one close to the other by which substantially Walls of tubes'are provided on three sides and over the topof the combustion chamber, and we have so arranged these .tubes a base drum which we have shown as of generally U shape, there being provided a connecting portion 11 and legs 12 extending therefrom. Each of these legs is provided with a removable cap 13 which may be removed for cleaning purposes. The connecting portion 11 is provided with an inlet conduit 14. which will be connected to the return line from the apparatus to which steam is supplied by the boiler. This base drum `10 is suitably supported in a frame work 15 by the ends of the arms extending through the framework as at 16, and the inlet conduit 14 extending throughV the framework as at 1'?, thus suitably supporting the base drum spaced from the floor or support for the boiler.

At the upper end of the boiler We provide a steam header 18 consisting of a suitable Water and steam compartment having outlet openings 19 and 20 for supplying steam to a house or other -apparatus or equipment to which the boiler is connected. Extending through this steam header, as shown in Fig. 1, is a smokestack or combus- .tion gas conduit 21 for the passage of flue gases therethrough.

The baseV drum and steam header are connected by a series of water tubes which provide for the circulation of rthe Water about the combustion chamber. rIhese tubes are arranged in compact relation as willbe seen from Fig. 4 and substantially form vertical walls about three sides of the combustion chamber which chamber we will designate generally as 25.

The water .tubes are arranged in what we conveniently term sets, each consisting of two tubes 26 and 27 extending from opposite legs 12 of the base drum and arranged in a single vertical plane extending laterally of, and at right angles, to the legs 12 of the base drum. The tube 26, asshown in Figs. 1 and 5, extends vertically a substantial ,distance and then is bent as at 28 to extend horizontally as at 29 then reversely bent as at 30 to extend in the opposite direction along a hori- Gti zontal path as at 31, thence again bent as at 32 to extend vertically as at 33 through the bottoni 34 of the header 1 8 to a point above the water level. Over the end of this tube there is a deiiector or baie 35 to throw downwardly any water ejected from the tube by thesteain formed, in the. tube and risingr therein.l The other pipes o the opposite the tube 26 lies in the same plane therewith vertical to, and at right angles to the parallel legs l2. This tube 27 extends vertically upwardly from the leg l2, is bent as at 36 to extend ser horizontally as at 37, is then bent reversely as at 33 to again extend in the opposite direction horizontally as at 39, and then is bent as at 4D to eX- tend vertically upwardly as at 4l through the wall 34 of the steam header to a point above` the Water line. Over the end of this pipe there is also located the baffle 35 as before mentioned;

As will be observed from Fig. 5 the bends 35, 3S and e() and the horizontal portions 3'? and 39 formed by these bends are located above thelevel ci the horizontal portions 29 and 31 of the pipe 26,1 andthe arrangenientis such that the reverse bends 3u and 38each apprcachclosely the verticalrising portions of the tubes 26 and 27 but eX- tend just short' thereofby which arrangement we are able to cornpactly arrange a set of a pair of tubes in a single plane with several sets oi such tubes` 26and 27 close together. In fact the distance betweenv the centers of the tubes of adjacent sets is such that anothery tubeof the same diameter could not be inserted between them.

Adjacent sets, however, are alternately arranged, that' is-the tubes 26 and 27`are placed. in the revers-e relation whereby if the tube 26 is on the right hand' side of one set itwill be on the left handV sideof the-next set, whereby'we will retain our horizontal portions in a balanced arrangement' and tubes on the opposite side of the boiler' will beA alternately iirst contacted' by the combusted gases, and by providingthese sets in reverse order we obtain a symmetrical arrangement throughout the entire length of the boiler. These sets of tubes 26 and 27 are the up-flow tubesl and as theyfextend'above the normal water level in the header 18 no down-flow will' be had through them. in order, however, that a downflow may be had we connect a series of back tubes li2 to extend' just through the Wall 341' and connecting the steam headerwith the base'Y drum 1'0' so that a circulation may be obtained downwardly through these pipes: to theV base drum 10 and upwardy through the up-iiow pipes 26 and 27T to the' header. All of these tubes, as will be apparent from the sectional' views of Figs. 3 and are positioned closely together and' form substantially a wall on three sides of thecombustion chamber, the front" side liSTbeing left open for the position of" an oil burner therein or if desired a grate may be supportedand a coal hre had in this combustion chamber.

The heat will be partially transferred from the combustion chamber to the Vertical portions of the tubes about this cumbuetion chamber and as the gas rises the heat will be transferred through the horizontal portions ofthe tubes 29 and'Bl first and STand 39`- secondarily after which these gases will contact and pass through the steam header giving up some of their heat to (j this part' of the furnace and' thence pass outwardly to the hue.

Contiinious circulation is obtained through these water tubes and by reason of their single horizontal loop greater circulation is` obtained ,l than were the tubes zig-zagged back and forth several times. Further, by reason of the tube extending horizontally across just short of its cooperating tube in the same plane two tubes, or a so-called set, may be formed in a single vertical plane, and a far more compact arrangement of. thetubes-is had than were the horizontal portion to extend slightly further intothev path of the vertical portion of the other tube in the set, and thus require it to be staggered to one side or the other of the vertical plane thereof.

The tubes are preferably Welded to the base drumand-header and thus securely held in place, andit will be apparent that other forms of headers and. bases may be used, and we have illustrated one other form of base consisting of a shallow box' construction 50 to which there is a top plate 51 welded, and into which container theseseries of tubes 26, 27 and 42 may be welded as above pointed out.

The combustion chamber is completed by a casing Walk extending about and enclosing the circulation pipes which wall is designated as 52 at thoisideab at the rear;. and 54 at the front, wall 54 being provided with suitable doors. 56, peephole 5T orrother desirable openings for-boiler construction.

In Fig-Wehaye illustrated: a. down-draft boiler` in which thetubes 26 and 27 are; substantially inverted, and the combustion chamber; arranged at 58 with. the draftV taking a downward. path across the: horizontal portionsA of the tubes and out through thefflueopening 59.. In-.this instance the longer straight portion: of the tubes extends up into theK steam header 18. but the uo 21. ex-

tending throughthe: steam header is absent, however otherwise the construction isy similarto the arrangement shown inlig.v 1: more fully above described.

The foregoing descriptioniisdirected solely towards the construction. illustrated;V butV we.. desire it; to be understood their we reservethe` privilege of resorting to all, the nrrecnanicalr changes to which;r the` device is susceptible; the invention being deiined andrlimitedionly by thaterms of the appended'. claims..

We. claim.:

1. In. a boiler, a. base' drum, a steam header, generally parallel verticali: rowso tubes. connect- 'ingrsaiddrunr and headerwith opposite tubes'in substantially thel same plane at' right` angles to the plane ofi thezrotvs of: tubes, the tubes of one row in each plane having portions extendingfhorizontally across into close adiacencyl toi the opposite/tubes.. inl the other row; off said plane with the horizontal portions oi?v opposite tubes staggered one with'. reference to the other, and with. the horizontal portions of' the tubes in adjacent planes oppositely arranged and also similarly staggered.

2. In. a boiler, a base drum, asteam header, sets of tubes connecting saidE drum and? header, each set comprising a pair of" tubes in a. single plane with eachtube generallyvertically arranged -andfhavlngportions extending horizontally/across toward the vertical portion of the other tube of the pair with they portions from one side. above orbelow the portionszoff'theother side, adjacent sets being oppositely arranged and4 alternate sets alike and said.' horizontal portions maintained in the samerelation toeachother;

3. In a boiler,y a base drum, a steam header, sets of tubes connecting said drum and header, each set comprising a pair` oftubes lin a single plane with each-tube generally vertically arranged andhaving portions extending horizontally across toward the vertical portion of the other tube of the pair with the portion from one side above or below the portion from the other side, said sets being in close parallel vertical relation adjacent sets being oppositely arranged and said horizontal portions maintained in the same relation to each other.

4. In a boiler, a base drum, a steam header, sets of tubes connecting said drum and header, each set comprising a pair of tubes in a single plane with each tube generally vertically arranged and having portions extending horizontally across toward the other tube of the pair, one tube of each set having its horizontal portion at a different level than the horizontal portion of the other tube of the set and adjacent sets being oppositely arranged and said horizontal portions maintained in the same relation to each other.

5. In a boiler, a base drum, a steam header, sets of tubes connecting said drum and header, each set comprising a pair of tubes in a single plane with each tube generally vertically arranged and having portions extending horizontally across toward the other tube of the pair, one tube of each set having its horizontal portion at a different level than the horizontal portion of the other tube of the set, and said sets being alternately arranged.

6. In a boiler, a base drum, a steam header, sets of tubes connecting said drum and header, each set comprising a pair of tubes in a single plane with each tube generally vertically arranged and having portions extending horizontally across toward the other tube of the pair a distance greater than half the distance between the tubes of the set, one tube of each set having its horizontal portion at a diierent level than the horizontal portion of the other tube of the set, and said sets being alternately arranged and closer together than'the diameter of a tube of a set.

7. In a boiler, a base drum, a steam header, sets of tubes connecting said drum and header, each'set having a right and a left hand generally .vertical tube in a single plane, the right hand tube of each set having a portion extending horizontally towards and in close proximity to the left handrtube and the left hand tube having a portion extending horizontally towards and in close proximity to the right hand tube, said horizontal portions being one above the other in each set, one set having the horizontal portion from the right hand tube below the horizontal portion from the'left hand tube and the next set having the horizontal portion from the left hand tube below the horizontal portion from the right hand tube, the lower horizontal portions all being at substantially the same horizontal level and the upper horizontal portions all being at substantially the same horizontal level.

WALTER S. ALMY.

CHARLES F. H. ALMY. 

